Fix delete page (#6356)

* 01 fix memory leak

* 02 delete useless side panel icon code

* 03 delete useless function

* 04 delete useless delete page

frontend/src/pages/wiki2/side-panel.js

@@ -30,18 +30,15 @@ const propTypes = {
 
 class SidePanel extends Component {
 
-  constructor(props) {
-    super(props);
-  }
-
   confirmDeletePage = (pageId) => {
     const config = deepCopy(this.props.config);
     const { pages } = config;
     const index = PageUtils.getPageIndexById(pageId, pages);
     config.pages.splice(index, 1);
-    // TODO: To delete a page, do you need to delete all subpages at once（update PageUtils delete a page)
     wikiAPI.deleteWiki2Page(wikiId, pageId).then((res) => {
-      this.props.updateWikiConfig(config);
+      if (res.data.success === true) {
+        this.props.updateWikiConfig(config);
+      }
     }).catch((error) => {
       let errMessage = Utils.getErrorMsg(error);
       toaster.danger(errMessage);